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InterviewSolution
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The table that follows shows some measurementf of the decay rate of a sample of `.^(128)I`, a radio nuclide often used medically as a tracer to measure the rate at which iodine is absorbed by the thyroid gland. `|{:("Time(min)",A (counts//s),"Time(min)",A(counts)//s,),(4,392.2,132,10.9,),(36,161.4,164,4.56,),(68,65.5,196,1.86,),(10,26.8,218,1.00,):}|` The half life `t_(1//2)` for this radio nuclide.A. `25 min`B. `50 min`C. `2.5 min`D. `5 min` |
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Answer» Correct Answer - A `A=A_(0)e^(-lambda t)rArrlnA=lnA_(0)-lambda t` `:. lambda=(lnA_(0)-lnA)/(t)=(6.2-0)/(225)=0.0275 min^(-1)` `:. T_(1//2)=(0.693)/(lambda)=25 min` |
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